求助og１２ sc７１

shaineby

encourage visitors to "touch" each exhibit and thereby (to) activate
为什么第二个to可以省呢？
我是菜鸟啊，希望得到高人指点！

fdrandom

to touch和to activate并列啊，后一个to可以省

shaineby

是所有　to。。and　to。。并列结构中第二个to都可以省么

robertwu82

同问，OG12SC75题75 A proposal has been made to trim the horns from rhinoceroses to discourage poachers; the question is whether tourists will continue to visit game parks and see rhinoceroses after their horns are trimmed.
(A)    whether tourists will continue to visit game parks and see rhinoceroses after their horns are
(B)    whether tourists will continue to visit game parks to see one once their horns are
(C)    whether tourists will continue to visit game parks to see rhinoceroses once the animals' horns have been
(D)    if tourists will continue to visit game parks and see rhinoceroses once the animals' horns are
(E)    if tourists will continue to visit game parks to see one after the animals' horns have been

正确答案C，官方解释D选项see 应该改为to see（D选项还有其他错误），这个解释不是与71题的正确选项矛盾了么。什么时候可以去掉动词不定式符号to，什么时候不可以去掉to